package com.xigege.nio.NIO案例;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;

import static com.xigege.nio.bufferAndChannel.util.ByteBufferUtil.debugRead;

/**
 * @author huangxi
 * @class NIOBlockServer
 * @description NIOBlockServer
 * @create 2022-08-15 16:16
 */
public class NIOBlockServer {
    public static void main(String[] args) throws IOException {
        // 使用 nio 来理解阻塞模式, 单线程
        // 0. ByteBuffer
        ByteBuffer buffer = ByteBuffer.allocate(16);
        // 1. 创建了服务器
        ServerSocketChannel ssc = ServerSocketChannel.open();

        // 2. 绑定监听端口
        ssc.bind(new InetSocketAddress(8080));

        // 3. 连接集合
        List<SocketChannel> channels = new ArrayList<>();
        while (true) {
            // 4. accept 建立与客户端连接， SocketChannel 用来与客户端之间通信

            System.out.println("connecting...");
            SocketChannel sc = ssc.accept(); // 阻塞方法，线程停止运行
            System.out.println("connected... " + sc);
            channels.add(sc);
            for (SocketChannel channel : channels) {
                // 5. 接收客户端发送的数据
                System.out.println("before read..." + channel);
                channel.read(buffer); // 阻塞方法，线程停止运行
                buffer.flip();
                debugRead(buffer);
                buffer.clear();
                System.out.println("after read...{}" + channel);
            }
        }
    }
}
